Experimental Study on the Dynamic Characteristics of Soil Reinforced with Fiber Yarn under Different Humidity Conditions

In practical engineering, the change of humidity will significantly affect the dynamic deformation characteristics of soil. Taking the fiber yarn reinforced loess as the research object, the dynamic triaxial apparatus was used to test the dynamic stress-strain, dynamic strength and seismic subsidence characteristics of fiber yarn reinforced loess under different water content conditions. The influence of different humidity on the dynamic stress-strain relationship, dynamic strength and residual strain (i. e. seismic subsidence coefficient)of fiber yarn reinforced loess is analyzed. The test results show that: Under the same confining pressure and dynamic shear strain, the dynamic shear stress of fiber reinforced loess first increases and then decreases with the increase of water content; Under the same vibration times, with the increase of water content, the dynamic shear stress first increases and then decreases; When the moisture content is near the plastic limit moisture content, the dynamic shear stress of fiber reinforced loess is the largest; Under the same vibration times, the residual strain of fiber yarn reinforced loess decreases first and then increases with the increase of water content; When the water content is near the plastic limit water content, the residual strain is minimum, when the water content exceeds the plastic limit water content, the influence of the increase of water content on the residual strain decreases gradually; With the increase of vibration times, the influence of the increase of water content on the seismic subsidence characteristics of fiber reinforced loess is gradually weakened. The research has important theoretical and practical significance for the construction of fiber yarn reinforced loess project.